Whole feed oats and "Oat seed" are about the difference of "half". Personally I haven't noticed any difference in deer preference, but there are many types of seed oats now. "Bob" oats, are probably the most planted nation wide for grazing (cattle), but there are many other cultivars.
I would venture between $50-100 an acre, but there are so many variables. Fertilizer prices aren't constant, but if you can buy in bulk and use their buggy, it is cheaper (a lot over bagged)
1st thing you need to do is get a soil sample, then you will have an idea of what and "if" you need, many areas of Texas have plenty of lime, but I am not real familier with ETX dirt. Sample is easy to do yourself, then send it to A&M, you will know in 10-14 day's.Here is the link
If it where me, I'd go with 60/40 Oats/Wheat, and a pound or two of arrowleaf clover, maybe some clay peas.
Outside of the soil sample, the next best thing you can do IMO, is have your county Ag (agriculture) agent come out, they are a free service and will know more than anyone what grows/does the best in your area, did I mention they are FREE..They can also walk your property and give you advice on things you can do to enhance the natural vegetation for wildlife. They also have a ton of literature in their offices you can get on almost every topic.